Stick to "last night" as native speakers do.
I agree about 'yesternight', though I would go further and say that it is incorrect in modern English. 'Yesterday night' is uncommon, but not strange, in my opinion.Both "yesterday night" and "yesternight" are theoretically fine but will get strange reactions. Stick to "last night" as native speakers do.
I agree about 'yesternight', though I would go further and say that it is incorrect in modern English. 'Yesterday night' is uncommon, but not strange, in my opinion.
Both "yesterday night" and "yesternight" are theoretically fine but will get strange reactions. Stick to "last night" as native speakers do.
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